WordPress does not allow UPLOADS to be an absolute path

[issactrotts]

The environment where I'm running WordPress does not allow writing to the app's directory tree after it has been deployed. However /tmp is writable, so I tried putting this line in my wp-config.php:

define('UPLOADS', '/tmp');

It didn't work though because WordPress prepends ABSPATH to it. Here are the places where that happens in the WordPress source code:

$ git clone https://github.com/WordPress/WordPress.git
$ grep -n '\$dir = .*UPLOADS' $(find . -name \*.php)
./wp-includes/functions.php:2033:               $dir = ABSPATH . UPLOADS;
./wp-includes/functions.php:2077:                               $dir = ABSPATH . UPLOADS;

Currently I'm working around this by running the following perl one-liner on the WordPress sources:

perl -pi -e 's/ABSPATH \. UPLOADS/UPLOADS/g' $(find wordpress -name \*.php)

[issactrotts]

Duplicate of #37743.